Delete unused BluetoothAudioSink code.

device/bluetooth/bluetooth_adapter_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/bluetooth/bluetooth_adapter.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 76 matching lines @@
       const ServiceOptions& options,
       const CreateServiceCallback& callback,
       const CreateServiceErrorCallback& error_callback) override {}
 
   void CreateL2capService(
       const BluetoothUUID& uuid,
       const ServiceOptions& options,
       const CreateServiceCallback& callback,
       const CreateServiceErrorCallback& error_callback) override {}
 
-  void RegisterAudioSink(
-      const BluetoothAudioSink::Options& options,
-      const AcquiredCallback& callback,
-      const BluetoothAudioSink::ErrorCallback& error_callback) override {}
-
   void RegisterAdvertisement(
       std::unique_ptr<BluetoothAdvertisement::Data> advertisement_data,
       const CreateAdvertisementCallback& callback,
       const AdvertisementErrorCallback& error_callback) override {}
 
 #if defined(OS_CHROMEOS) || defined(OS_LINUX)
   void SetAdvertisingInterval(
       const base::TimeDelta& min,
       const base::TimeDelta& max,
       const base::Closure& callback,
@@ skipping 752 matching lines @@
                                GetConnectErrorCallback(Call::NOT_EXPECTED));
   SimulateGattConnection(device);
   EXPECT_EQ(1u, adapter_->GetDevices().size());
   RemoveTimedOutDevices();
   EXPECT_EQ(0, observer.device_removed_count());
   EXPECT_EQ(1u, adapter_->GetDevices().size());
 }
 #endif  // defined(OS_ANDROID) || defined(OS_MACOSX)
 
 }  // namespace device